Originally Posted by Lindy
Probably Juggernaut.
He is THE Unstoppable Force, only by removing his helmet and having a psychic like Professor-X put him to sleep can stop him, and it takes a good portion of the X-Men to even knock his helmet off.
No, Superman is not invincible, yes he can be killed, assuming a Marvel to D.C. then Juggernaut WOULD kill Superman.
Of course, removing the techno-organic virus from Cable, he'd destroy everything since he's the most powerful telekinetic mutant (currently written anyway), the kind that sub-consciously deconstructs houses; but then there's nuffin that I've seen so far to suggest removing the TO-Virus.
I supposes Onslaught would be up there in the tops as well, but that's not exactly a constant thing.
Uhm, the Silver Surfer as well is pretty insanely powerful, destroying an entire planet of Venom-like symbiotes with relative ease. That and I think he can freeze his targets in stasis or something similar.
That's about all I can think of, off the top of my head.
Oh yeah, and Deadpool, like Wolverine, but with a faster healing factor and more controlled. Deadpool can lose an arm and regrow it instantly at will, so he's basically invincible.